Road paving machine



I Nov. 29, 1938, E, B. JQRGENSE l 2,138,103

ROAD PAVING MACHINE Original Filed April 50, 1935 3 SheebS-She'ei lINVENTOR.

ATTORNEY.

Nov. 29, 193s. E; JORGENSEN 2,138,103

ROAD PAVING MACHINE Original Filed April 30, 1935 3 Sheets-Sheet 2INVENTOR.

BY/wfm ATTORNEY.

Nov. 29, 193s. E, B, JORGENSEN 2,138,103

ROAD PAVING MACHINE original Filed Apri-1 so, 1935 s sheets-sheet 3ATTORNEY.

Patented Nov. `29, 1938 Y. .l

` 2,i3s,1o3 f f ROADPAVING'MACHINE y Enoch BergJorgensen,LosAngelea'fCalf., as-l `signor, by mesne assignments, toViber Company, Los Angeles,lCalif,.,a corporation of CaliforniaYContinuation of application Serial No. 19,055, April 30,1935.y Thisapplication Augst 9, 1937,

Serial No. 158,150

` v claim. (crei-48x UNITED T-STATE This invention relates to pavingmachines, and which.k holds the strike-off ,bar 132 in rigid posiinparticular tomachines for laying plastic mation relative to the carriageframe, is afnishing terials such as concrete upon a prepared roadway;plate 38 which is free to be moved over the top This application `is acontinuation of -myg cof; ,surface4 ofthe paving material. Inthefollowing 5 pending application Serial No. 19,055, led April descriptionand claims,concrete is specifically re- 5 v 30, 1935. The objects of my;invention are to pro- `ferred to, but the machine may be usedin WOIk-vvide a machine which levelsoffand compacts a ing anyother suitableplasticmaterials which mass of concrete or other plastic materialsplaced may be employed for paving, including black or upon the roadway;to; provide a machine ,whichV asphaltic'mixtures and the like. 1 l Lvibrates the concrete andother plasticmaterials u My machine ispreferably used along a roadway 10I in place on the roadbed; to provideamachine which has been graded and prepared for paving which givesvacompactand finished'pavementpto by providing headers l1 for the marginsof the provide a machine with means for vvibratingrthe.v pavement. It isalso usually the practice to in plastic material on a roadbed betweencrosswise sert at intervals, cross-members, indicated at 43, i lexpansion joints, and with means for raising and which may be lumber, ormay be pre-formed ex- 15 lowering the vibrating mechanism over ,these ipansion joint vmemberamade of compositionvma# joint members; toprovide.a .method for placing terials. The Wheels yI6 of the carriage of mymaand finishing -a plastic massas. a paving. These chine are designed toroll` on the headers .|1, and other objects will be apparent from the0folalthough lother traction means may be employed;

zo lowing description and the drawings in which The carriage may bepropelled along thehighway Fig. 1 is a side section taken v4at l-I `ofFig. 4, by any suitable means, such as a motor mounted of one form of mypaving-machine; von thecarriageto `drive thewheels I6 or'the ma- Fig. 2is a partial side section taken-at 2-2 of chine may be attached to`otherequipment used i Fig. 3, of a portionof my machine showing thesimiliarly over the roadway; or by tractors at the g5 vibrators in apartly withdrawn position. I side of the roadway. Also there maybe'assembled 25 Fig. 3 is a forward end elevationof the machine, onvthecarriage of my machine a gas" propelled with the vibrators in positionindicated in Fig.: 2,.v engine to drive 'the vibratorsA directly throughand with parts and gportionsibrokenaway to flexible 4drive shaftsorvagas propelled motor for facilitate illustration; ydriving aircompressors tofurnish compressed air Fig. 4 is a pl view of the pavingmachine, with for air motors attached tothe vibrators 20, or 30 partsand po ions removed to facilitateV illustrafor driving a generator tosupply electrical-energy tion. for the .vibrator motors 22 if Aelectricmotors. My paving machine, in, one form, consists of a. This auxiliaryequipment maybe selected to suit carriagehaving side members H, crossmembers the conditions applying where the road yis` being I2, I3, I4,and |5,'wheels I3 adapted to travel onpaved. y y 35 headers or sideboards Il forming the iside mar-l The structure of my machine may belvaried ingins of the roadway. The wheels .Ilaresup-` detail,thearrangementshown being simple and ported in bearings lby shafts I9.llVibrators 20y ydesigned toillustratethelprinciples, andtoshow connectedby flexible driveA shafts .2l to'rotary 'one embodimentof myinvention".v `Four Asimilar means 22 are mounted by clips 30 uponsupportvibratorunits20 are shown butrany number may 40 members 23 which .areattached to the shaft 24, besused; asrequired, toset the concrete insuitwhich is adapted to-be rotated inthe bearings 4l' :able'vibrationacross the full width of the paving mounted on the side members I I..Arworm 25 on' strip or slab. AItvhas' been well demonstrated here-` ashaft 26 rotatably held inbrackets 21 and havr`tofore that highfrequency vibration `oftunset y i5 ing a handwheel 28 operates throughthe vvorm' concrete mixes causes the material to flow and be 45 gear29to raise and lower thesupport members compacted into a designatedspace,` giving' a 23, and the vibrators20 attached thereto. "L'ongildenser and strongerfnished concrete. vThe tudinalsupport members 3|:for'theraislng and vIvibrators may be of any suitablefmechanism loweringmeans are attached tothe. carriage cross J which will produce'. highfrequency/vibrations `in f members r'I3 and I4. A strike-off bar 32vwhose theV concrete; an eccentricxweight mounted upon 50 verticalposition is adjustable by means of slots a shaft within a protectingshellbeing a preferred 33 and bolts and nuts,34,:isattached totheunderform. Such a .vibrator is shown in my co-pending side of thecarriageframe by bracket means 35,r patent applicationASerial No.,'7,927`datedvFebruwith angle braces 36 to the cross-member I4.` At.- lary 23,'1935, issuedl as Patent No.v 2,018,789

tached by chains 3l to theebracketmeans 35, October29, 1935. By the use'of yvibration fre- 55 vibrated rapidly by the rotation of the 'motors 22'A through the flexible drive shafts 2| quiciqy dig their free ends intothe moist loose concrete. Simultaneously the paving machine is movedforward along the roadway and the vibrator tubesy 20 take the positioninclined downwardly and rearwardly as indicated in Fig. 1, and arepulled in this position through the concrete. This inclined position ofthe vibrator has been found to be important in producing' a compact massof` concrete, and in closing up the furrow made by the vibrator as itpasses through the mass. It has also been found that by using thevibrator tube in this inclined position that any air trapped in theconcrete, which would cause voids, passes up around the inclined tube,thus allowing the Y concrete immediately above the lower .tip of thevibrator tube to be compacted from the bottom to the top of the layer. A

' While the use of my machine requires that the concrete mass bedistributed fairly evenly over i' the roadbed ahead of the machine, toovercome the disturbance oflevels caused by pulling the vibratorsthrough the concrete. and to provide for the final leveling of the topsurface after compaction, a strike-off bar 32 is placed abovev thevibrators 2 0 in their lower position. It has been foundtha't since thevibrators 20 cause the mass of concrete in ,the immediate surroundingsto vibrate, that this strikefofvbar 32 will function best if rigidlyattached to the carriage frame. -f

, the mass is stillvibrating. I

Its vertical position is made adjustable to suit the particularoperating conditions. As pointed out, as the concrete is vibrated,someofthe "cement paste, that is some fines including cement with water comesto the surface, following particularly'the path of the inclined vibratortubes.

The strike-ofi bar 32 levels off theconcr'ete, particularly this-finematerialwhich floats to the top, and the final road finish is producedby the finishing plate 38, which is attached behindthe strike-off bar 32and directly above the lower end of the partly submerged inclinedvibrator tube 20, in its lower position. I have discovered that a sheetmetalA plate 38, preferably'curved with the convexsurface formingthecontact on the surface of the concrete, and without weighting, andattached for loosely draggingover the surface, gives a satisfactory roadsurface finish. The concrete under the finishing plate 38 is invibrating condition from the action Aci' the vlbrators 20. Vibrationsare transmitted vto-the plate 38, and this, floating plate under its ownweight brings the proper amountof fine material and water to the surfaceto insure the correct surface compaction and smoothing. f

To avoid or skip the cross-partitions or. ex-

pansionjoints which are used in long stretches of pavement,Athevibrators 20, as they approach these cross members V40 are graduallyraised to a vertical position as indicated in Fig. `2. The vibrators arethen lifted out ofthegconcrete by the further rotation of the supportl23, thus vibratingall of the concrete upto the Joint and attached asshown, or coupled up tothe top surface where the vibrator leaves theconcrete.

As the whole machine is moved forward. the vibrators 20 are re-insertedin the concrete (to the left of 40 in Fig. 2) and the `vibrators againtake the inclinedpositions as shown kin Fig. 1 as themachine moves stillfarther forward. 4'I'he vibrators 20 must be kept operating, thatv isvibrating, during the insertionI passage through,

v and withdrawal from the concrete mass on the roadbech In the preferredarrangement of parts, as shown and above described, electric motorsdrive the eccentrically weighted shafts in the vibrators 20, through theflexible drive shafts 2|; and in each unit the motor. and vibrator areso placedas to more or less counterbalance each other on the supportingmembers 23. The vibrators 20 may be operated inany suitable manner, byelectric motors, or air motors, and they may be close to the vibratingtubes 20. The arrangement shown provides the necessary flexiblevibration-dampening connectionbetween the motor andthe vibratorl itself,and the support 23, so that the whole ma4 l chine-is -not vibrated, and-thus increasing the available vibrational energy which may betransmitted directly tothe concrete. The vibrator'k units' 20 may be soconstructed as to contain the motive power andthe eccentric weight asvan integral yvibrating mechanism.

'I'he method of operation consists in vibrating the spread-out concretemass by Ipulling through it vpartly submerged vibrating elements, hereby1 causing the unset concrete in proximity with the vibrators to be setin vibration, and simultaneously striking ofi the top surface by meansof a rigid strike-off bar, and smoothing and slicking over the iinemixture of sand', cement and water which rises tothe' surface duringvibration, by dragging a finishing 'plate over the surface immediatelyafter the vibration, and while While I have lillustrated my invention byone preferred embodiment, I do not wishto be limited bythis particulararrangement of parts, but desire to include within the vscope of myinvention thecombinations and' arrangements substantially as set forthin the following claims.

1. In a road paving machine adapted to travel along a prepared roadwayupon which has been placed aniunset-and uncompacted concrete mixyture,vibratorymeans attached to said carriage Y land adapted toA be movedthrough-the concrete,

a crosswise top-'leveling strike-off bar rigidly attached to thecarriagevof said machine and'adapted to roughly level oil.' the topsurface of the vibrating concrete mixture between said vibratory meansand said strike-off bar, an unsupported surface-finishing plate adaptedto'float on the top surface. of the concrete and to be dragged over theconcrete surface behind-the strike-off v bar4 at a' positionsubstantially directly over'the lower end of the vibratory means. v

,2. Inl a road paving machine adapted to travel along a prepared roadwayupon which has been distributed an unset and uncompacted concretemixture, partly. submergible tubular vibratory means inclined downwardlyand 'rearwardly rela- `tive to nthe forward end of 'the machine andadapted to be moved in this position through4 the unset concretewith-the forward movement of the machine.l acrosswise top-levelingstrike-'ofi' bar rigidly attached to the carriage of said ma chine at aposition rearwardly of the top surface end of said vibratory means, anda surface-finishing plate adapted to be dragged over the vibratingportion of the concrete at a position substantially above the lower endof the vibratory means and rearwardly of the strike-off bar.

3. In a road paving machine, a carriage adapted to travel along aroadway upon which has been distributed an unset concrete mixture,insertible vibrators connected by ilexible shafts to rotary means,supporting means for said vibrators adapted to hold said vibrators in arearwardly inclined position in said concrete mixture during vibrationand forward movement of the carriage and also adapted by rotation towithdraw and insert the vibrators in the concrete, means for rotatingsaid support, a finishing plate positioned on the concrete surface abovesaid inclined vibrators in their fully inserted position and adapted tobe dragged by the carriage over the surface of a vibrating portion ofthe concrete.

4. In a road paving machine, a carriage adapted to travel along a'roadway upon which has been distributed an unset concrete mixture,insertible vibrators, actuating means for said vibrators, supportingmeans for said vibrators and actuating means attached to said carriageand adapted to hold the vibrators within the concrete mixture duringvibration and forward movement of the carriage and to withdraw or insertthe vibrators in the concrete, means for rotating said support, astrike-off bar attached to the carriage across the roadway andrearwardly of the point of insertion of the vibrators, and a finishingplate positioned rearwardly of the strike-off bar and adapted to bedragged by the carriage over a vibrated portion of the concrete.

5. In a road machine, a carriage adapted to travel along a preparedroadway upon which has been distributed an unset and uncompactedconcrete mixture, partly submergible tubular vibrators inclineddownwardly and rearwardly relative to the forward end of themachine andadapted to be moved in this position through the unset concrete, meansfor actuating said vibrators, supporting means for said vibrators andactuating means adapted to move in a circular path perpendicular to theroadway surface, the vibrators being disposed tangentially to thiscircular path so that at the lower end of the path the vibrators are ininclined position within the concrete and at the upper end of which paththe lowest portions of the vibrators are entirely out of and above theroadway, means for moving the support through said circular path, acrosswise top-'leveling strike-ofi bar rigidly attached to said carriageat a position rearwardly of the points of entry of said vibrators intothe concrete, and'asurface nishing plate extending transversely betweenthe margins of said roadway adapted to be dragged over the vibratedconcrete at a position substantially directly above the lower end of thevibratory means and rearwardly of the strike-off bar. t

6. In a road paving machine adapted to travel along a prepared roadwayupon which has been distributed an unset concrete mixture, a carriage, apluralityof encased rotary vibratory mechanisms, means attached to saidcarriage for raising and lowering said vibratory mechanisms into and outof the unset concrete, attaching means for said encased vibratorymechanismsto said raising and lowering means including a non-rigidconnection between said encased mechanism 'and said means for raisingand lowering adapted to prevent the vibration of said raising andlowering means, rotary means for actuating said vibratory mechanisms, acrosswise strike-off bar rigidly attached to the carriage of saidmachine and adapted to roughly level off the top surface of thevibrating concrete mixture between said vibratory means and saidstrike-off bar, and a surface finishing plate extending transverselybetween the margins of said roadway adapted to be dragged over thevibrating concrete at a position substantially directly above the lowerend of the vibratory means and rearwardly of the strike-oir bar.

7. In a road paving machine adapted to travel along a prepared roadwayupon which has been distributed an unset concrete mixture, a carriage,a' plurality of encased rotary vibratory mechanisms, lever meansattached to said carriage for inserting and withdrawing said vibratorymechanisms into and out of the unset concrete and for holding saidvibratory mechanisms in inclined position downwardly and rearwardly ofthe front ofthe machine, attaching means for said vibratory mechanismsto said lever means including a non-rigid connection between saidencased mechanism and said lever means adapted to prevent the vibrationof said lever means, rotary means for actuating said vibratorymechanisms, a crosswise strike-olf bar rigidly attached to the carriageof said machine and adapted to roughly level oi the top surface of thevibrating concrete mixture between said vibratory means and saidstrike-off bar, and surface iinishing plate extending transverselybetween the margins of said roadway adapted to be dragged over thevibrating concrete at a position substantially directly above the lowerend of the vibratory means and rearwardly of the strike-off bar.

l ENOCH BERG JORGENSEN.

